Loading device for top rollers op drawing
mechanisms op spinning machines



July 27, 1965 s. KEMMLER LOADING DEVICE FOR TOP ROLLERS OF DRAWINGMECHANISMS OF SPINNING MACHINES 2 Sheets-Sheet 1 Filed July 24 1961INVENTOYR SIjMU-"M/ mm/er ATTORNEYS July 27, 1965 s. K MLER 3,196,493

LOADING DEVICE FOR ROLLERS OF DRAWING MECHANISMS OF SPINNING MACHINESFiled July 24, 1961 2 Sheets-Sheet 2- INVENTOR slam/v0 KEMMLfR ATTORNEYSUnited States Patent 3,196,493 LOADING DEVICE FUR T01 ROLLERS 0F DRAWINGMEEHANISMS 0F SPINNING MACHINES Sigmund Kemmler, Geislingcn, Steige,Wurttemberg, Germany, assignor to Wurttembergische SpindelfabrikG.m.b.H., Sussen, Wurttemherg, Germany Filed July 24, 1961, Ser. No.126,320 Claims priority, application Germany, Aug. 19, 1960, W 28,406 11Claims. (Cl. 19-272) The present invention relates to a loading orweighting device for the top rollers of drawing mechanisms of spinningmachines, and more particularly to a magnetic loading device for suchtop rollers.

For loading the top rollers of drawing mechanisms of spinning machinesit has already been proposed to magnetize these rollers, which are madeof steel, so that the magnetic forces acting between them and the bottomrollers will produce the desired load thereon. This manner of loadingthe top rollers has been primarily applied to the slip rollers ofslip-draft mechanisms in which the magnetization was intended to effecta retarding action upon the slip rollers in order to take up the angularmomentum of these rollers. It has also been proposed to provide the toprollers with a core of a magnetically highly saturable alloy in order toproduce a sufficient clamping pressure.

Since with such devices it must always be expected that the magnetic toprollers will also attract other metallic bodies, and since such rollersprevent the use of the conventional bearing means therefor because ofthe interference which they would cause in the magnetic flux, it

has also already been proposed to provide each bearing saddle with amagnet at the side facing toward the respective bottom roller. Such anarrangement allows, however, very little space for the magnets, and themagnetic forces generated are therefore hardly sufficient to produce aclamping pressure of an adequate strength.

It is an object of the present invention to provide a magnetic loadingor Weighting device for the drawing mechanism of a spinning machine inwhich the magnets may be made of such a size that practically anydesired loading pressure may be attained. This object is attainedaccording to the invention by the provision of magnets for loading eachtop roller formed of two parallel arms and a magnetic block, by securingthese magnets on the guide arms of the top rollers by means of specialholders, by making the bearing members or bearing saddles for the toprollers of a nonmagnetizable material, and by mounting these bearingsbetween the two arms of each magnet so as to be held or guided thereby.These bearings or saddles for the top rollers are preferably made ofplastics.

The saddle-shaped bearings may be placed directly upon the shafts of thetop twinrollers or the bearing members which are mounted between thearms of the magnets may be fitted upon the end journals of the toprollers. It is also possible to apply a combination of thesearrangements, in which case each top twinroller is then loaded by threemagnets. Each loading magnet or pair of magnets may be adjustablymounted on and secured to a separate arm which may be pivoted about anaxis which lies within an arc the center of curvature of which lieswithin the axis of the respective bottom roller when the top roller isin the operative position. The loading magnets may, however, also bemounted on a common supporting arm and each of them may be pivotable onsaid arm about a pin or bolt which is adjustable within an arcuate slot.Especially if the magnets act upon the two end journals of each toproller, it is possible according to the invention to guide the magnetsrelative to the respective bottom roller by means of simple bifurcatedmembers of a nonmagnetic material, for example, of plastic. If thebearing members or saddles between the magnet arms are designed so as tobe adjustable in the direction of these arms, small differences in thethickness of the coatings or covers on the top rollers may be easilycompensated so that the air gap between the magnet and the bottom rollerand thus also the load upon the latter will remain uniform. The bearingmembers or saddles may, however, also be similarly adjusted for varyingthe size of the air gap and for thus varying the force of the load. Inorder to facilitate the manipulation and servicing of the mechanism, thesame may also be designed so that, when the supporting arm or arms arepivoted upwardly, the individual top rollers will not be liftedsimultaneously but will be successively lifted off of the bottomrollers. This considerably facilitates the interruption of the differentmagnetic circuits and also permits a partial release of the drawingmechanism.

The aforementioned as well as additional objects, features, andadvantages of the present invention will become more clearly apparentfrom the following detailed description thereof, particularly when thesame is read with reference to the accompanying drawings, in whichFIGURE 1 shows a drawing mechanism with several supporting arms in alongitudinal section taken along line I-I of FIGURE 2;

FIGURE 2 shows a cross section taken along line 11-11 of FIGURE 1;

FIGURE 3 shows a side view of a magnet which is tted upon an end journalof a top roller;

FIGURE 4 shows a front view of a magnet according to FIGURE 3; whileFIGURE 5 shows a side view, partly in section, of a drawing mechanismwith magnets mounted on a common supporting arm.

Referring first to FIGURES 1 and 2 of the drawings, the individualsupporting or guide arms 1, 1' and 1" for the top twinrollers 2, 2', and2" of the drawing mechanism carry magnet supports 3, 3', and 3" whichare provided with arcuate dovetailed guide surfaces 4, 4, and 4",respectively. The centers of curvature of the arcs of guide surfaces 4,4', and 4 coincide in the operative position with the axes of the bottomrollers. It is thus possible to adjust the top rollers freely toward thefront or rear relative to the bottom rollers without changing thedistance of the pole faces from the bottom rollers.

The magnet supports 3, 3', and 3" carry magnet holders 5, 5, and 5"which may be clamped to the arcuate dovetailed guide surfaces 4, 4', and4", respectively. The sides of the magnet holders facing toward thebottom rollers are also provided with dovetailed guides 7, as shown inFIGURE 2, which, however, are not curved but straight. These guides 7are adapted to receive magnet arms 8, 8', 8", and 9, 9', 9",respectively, the upper ends of which extending beyond the magnet blocks1%, 19', and It)" are slipped over the guides 7'. The magnets are lockedto the magnet holders by means of shims 11, 11, and 11 which are securedby bolts 6, 6, and 6", respectively. The position of shims -11' has beenillustrated in FIGURE 2. Underneath the magnet blocks '10, 1t), and 10",the nonmagnetic saddle-shaped bearings members 12, 12', and 12" for theshafts 13, 13', and 13" of the top rollers are mounted between the twoarms of the respective magnets. Wedge gibs 14, 14, and 14- which areslidable in :a direction vertically to the magnet arms permit thebearings 12, 12, and 12" to be adjusted by setscrews in the direction ofthe magnet arms, whereby the distance between the pole faces and thebottom rollers may be very accurately regulated. The lower ends of themagnet arms serving aspole pieces are I duced by the three magnets maythus be overcome suc-i cessively which facilitates the manipulation of.the

mechanism. e V

FIGURES 3 and 4 illustrate a modification of the in vention as appliedto individual top rollers or twin top rollers, which have a journal 47on each outer end.

magnetic circuit between these two rollers.

further raised, magnet holder 55 takes along arm 51 and pivots the sameabout rod 66, whereby pawl 69 engages with hook 7i), lifts the centralmagnet and top roller off the associated bottom roller, and therebyinterrupts the Not until this has occurred during the continued upwardmove- 'ment of arm 51, will pawl 69' also engage with hook 74)v and liftthe last magnet and top'roller off the associated bottom-roller. Theinterruption of the different magnetic circuits thereforeoccurssuccessively and may thus be carriedjout without any great physicaleffort. If the distances between pawl 6g and the clamp "76 provided onthe magnetic'holder 55' is maintained considerably Each of thesejournals 47' of each top rollerv or twin top.

roller. may be equipped with a magnet which consists of the magnet arms38 and 3? and the magnet block 40 between these arms. The nonmagneticbearing member 42 is slipped over journal 47 and it may be adjusted in adirection parallel to the magnet arms by the Wedge gib 44 by means of asetscrew 48. :A bifurcated member 34- which may consist, for example, ofplastic, is

firmly secured tothe magnet'by screws 49; If the lower ends of the.magnet arms 38 and '39 are'disposed at the same distance fromthebottomjroller, the magnetic greater than the distance of pawls 69'fromthe clamp 7d, then the magnetic flux of the pairof inlet rollers52",62 will initially be interrupted during the upward movement of arm51, and only thereafter that of the central pair of rollers 52', 62C I IIf arm 5l'is pivoted upwardly directly and magnet holder 55 is notraised by handle 68, the feed rolleror the central top roller or. bothmay be released without affecting the load upon the delivery roller.However,

7 the air gap ofthe magnet for the delivery roller then "changesslightly so that the load is slightly decreased.

Such a partial release of the load during which the yarn still remainsclamped betweenthe delivery-rollers is sometimes desirable when themachine is to. remain inoperative forces act'symmetrically relative tothe longitudinal axis of the magnet which also intersects with the axisof the top roller. The twoarms of the bifurcated member 34 whichsurround the bottom roller are then not subjected to any lateral forcesso that the friction between these two arms and the bottom roller is ofno conse- 1.

quence, especially if member 34 is made of a plastic with good bearingproperties. merely have to serve the purpose of insuring thatthepole Thetwo'arms of member 34 pieces, that is the lower endsof the magnet arms38 and V 39 remain equally spaced from the bottom roller.

FIGURE 5 illustrates .a further modification of the invention in which asingle main supporting arm 51 which is pivotable about the fixedsupporting rod 66 is provided for the magnets of all three top rollers.Supportby sliding the pivot pin or bolt 67 along slot 5 Magnetholder 55is provided with an extension 68 which serves as an operating handle.

arm 51 further carries pawl-like brackets 69 and 69' which are adaptedto hook over projections 7t? and 7th on. the I magnet holders 55 and55", respectively, and are adjustable relative to magnet holders55 and55" and their hookl shaped projections 76) and 74?, respectively. Thedistance between the engageable surfaces of parts 69 and 79 is Thesupporting ing arm 51 carries the magnet supports 53, 53', and 53 whichare slidably adjustable thereon The magnet hold- .or backwardly relativeto the associated bottom roller scribed with for'agreater length oftime, forexample, for several days. Although my invention has beenillustrated and dereference to the preferred embodiments thereof, I wishto have it understood that it is in no way limited to the details ofsuch embodiments, but is capable of numerous modifications withinthe'scope-of the appended claims.

Having thus fully disclosed my invention, what I claim is: a

1-. A device for loading the top 'rol'lers of a' drawing mechanism for aspinning machine comprising at least one pair of associated top andbottom rollers, at least a part of said bottomroller consisting ofa'magnetizable material, a supporting arm, means for pivotably mountingsaid supportingarrn near one end, magnet means associated with said pairof topand bottom, rollers, said magnet means including a pair of spacedmagnet arms, means f for securing one end of each magnet arm of saidmagnet means to said. supporting arm, the other end of each of saidmagnet arms opposite said supporting arm being spaced by 'an air gapfrom said magnetizable part'of said bottomyroller, and abearing memberof a non-magnetizable material mounted between said magnet armsfor r0-itatably mounting said-top rollen; g 2. A device for. loading the toprollers of a drawing mechanism for a spinning machine comprisingaplurality of pairs of associated top and bottom. rollers arrangedpreferably made smaller than'the distance between the engageabiesurfaces of parts 69" and iii. Whenthe separately from and behind eachother in, a row at least a part of each of said bottom rollersconsisting of a magnetizable material, a' plurality of supporting arms,means for pivotably mounting each supporting arm near one end thereof,magnet means associated with each respective pairof top and bottomrollers, each said magnet means including a pairof spaced, essentiallyparallel magnet arms anda magnet block secured between said magnet armsto maintain'the same in spaccd'relationship, means for seroller and the"associated magnet will be interrupted.

Magnet holder 55 will then be, arrested. in its upward position by asnap spring 72 on arm 51 which engages curing one end ofeach magnet armof a respective magnet a spaced by an air gap from said magnetizablepart of each into a detent 71. In this manner it is possible to releaseI and also to remove the top delivery roller without requiring thesupporting arm 51 to be pivoted upwardly. a

If arm 51 should be pivoted upwardly for cleaning,-

1 rollers;

releasing, or removing any or all top rollers magnet v holder 55 isfirst pivoted by handle 68' until its detent respective bottom roller,and a bearing member of non magnetizable material mounted between saidmagnet arms 'of each magnet means for lrotatably mounting said top 7 3.A ldevice for loading the top rollers of a drawing mechanism foraspinning machine comprising at least one pair of associated top andbottom rollers, at least a part of said bottom roller consisting of amagnetizable material, at least one supporting arm, means for pivotablymounting said supporting arm near one end thereof, magnet meansassociated with said pair of top and bottom rollers, said magnet meansincluding a pair of paced magnet arms, means for securing one end ofeach magnet arm of said magnet means to said supporting arm, the otherends of said magnet arms opposite said supporting arm being spaced by anair gap from said magnetizable part of said bottom roller, a bearingmember of a nonmagnetizable material mounted between said magnet armsfor rotatably mounting said top roller, and means for adjusting theposition of said bearing member in a direction parallel to said magnetarms.

4. A device for loading the top rollers of a drawing mechanism for aspinning machine comprising at least one pair of associated top andbottom rollers, at least a part of said bottom roller consisting of amagnetizable material, at least one supporting arm, means for pivotablymounting said supporting arm near one end thereof, magnet meansassociated with said pair of top and bottom rollers, said magnet meansincluding a pair of spaced magnet arms, means for securing one end ofeach magnet arm of said magnet means to said supporting arm, the otherends of said magnet arms opposite said supporting arm being spaced by anair gap from said magnetizable part of said bottom roller, a bearingmember of a nonmagnetizable material mounted betwen said magnet arms forrotatably mounting said top roller, said bearing member having a surfaceinclined to said magnet arms, a wedge-shaped member between said magnetarms engaging with said inclined surface, and means for adjusting saidwedge-shaped member in a direction substantially at right angles to saidmagnet arms for adjusting the position of said bearing member in adirection parallel to said magnet arms.

5. A device for loading the top rollers of a drawing mechanism for aspinning machine comprising at least one pair of associated top andbottom rollers, at least a part of said bottom roller consisting of amagnetizable material, at least one supporting arm, means for pivotablymounting said supporting arm near one end thereof, magnet meansassociated with said pair of top and bottom rollers, said magnet meansincluding a pair of spaced magnet arms, means for securing one end ofeach magnet arm of said magnet means to said supporting arm, the otherends of said magnet arms opposite said supporting arms being bent towardeach other and their end surfaces spaced by an air gap from theperipheral surface of said magnetizable part of said bottom roller, abearing member of a nonmagnetizable material mounted between said magnetarms for rotatably mounting said top roller, and means for adjusting theposition of said bearing member in a direction parallel to said magnetarms.

6. A device for loading the top roller of a drawing mechanism for aspinning machine comprising at least one pair of associated top andbottom rollers, at least a part of said bottom roller consisting of amagnetizable material, at least one supporting arm, means for pivotablymounting said supporting arm near one end thereof, magnet meansassociated with said pair of top and bottom rollers, said magnet meansincluding a pair of spaced magnet arms, means for securing one end ofeach magnet arm of said magnet means to said supporting arm, the otherends of said magnet arms opposite said supporting arm being spaced by anair gap from said magnetizable part of said bottom roller, at bearingmember of a non-magnetizable material mounted between said magnet armsfor rotatably mounting said top roller, means for adjusting the positionof said bearing member in a direction parallel to said magnet arms, anda bifurcated member of a non-magnetizable material mounted on saidmagnet arms and having a pair of guide arms, said magnetizable part ofsaid bottom roller being disposed between said guide arms and inslidable engagement therewith for maintaining the open ends of saidmagnet arms at an equal distance from said magnetizable part of saidbottom roller.

7. A device for loading the top rollers of a drawing mechanism for aspinning machine comprising a plurality of pairs of associated top andbottom rollers arranged separately from and behind each other in a row,at least a part of each of said bottom rollers consisting of amagnetizable material, each of said top rollers being formed by twinrollers and a shaft portion interconnecting said rollers, a plurality ofsupporting arms, means for pivotably mounting each supporting arm nearone end thereof, magnet means associated with each pair of top andbottom rollers, each said magnet means including a pair of spaced magnetarms, means for securing one end of each magnet arm of a respectivemagnet means to a respective supporting arm, the other end of saidmagnet arms opposite said supporting arm being spaced by an air gap fromsaid magnetizable part of each respective bottom roller, and a bearingmember of a non-magnetizable material mounted between said magnet armsof each magnet means for rotatably mounting said shaft portion of each 0said top rollers.

8. A device for loading the top rollers of a drawing mechanism asdefined in claim 6, wherein said top roller includes a journal at eachend thereof, and said bearing member is associated with said journal,said bearing member being slipped over a respective journal.

9. A device for loading the top rollers of a drawing mechanism for aspinning machine comprising a plurality of pairs of associated top andbottom rollers arranged separately from and behind each other in a row,at least a part of each of said bottom rollers consisting of amagnetizable material, a separate supporting arm for each of said toprollers, means for mounting said supporting arms near one end for aseparate pivoting movement about a common axis, at least one magnetmeans associated with each pair of top and bottom rollers, each saidmagnet means including a pair of spaced magnet arms, means for securingone each of each magnet arm for a respective magnet means to arespective supporting arm and for adjusting said respective magnet meansto different positions along the length of said supporting arm, theother ends of said magnet arms opposite said supporting arm being spacedby an air gap from said magnetizable part of said bottom roller, and abearing member of a nonmagnetizable material mounted between said magnetarms for rotatably mounting said top roller.

10. A device for loading the top rollers of a drawing mechanism for aspinning machine comprising a plurality of pairs of associated top andbottom rollers arranged separately from and behind each other in a row,at least a part of each of said bottom rollers consisting of amagnetizable material, a separate supporting arm for each of said toprollers, means for mounting said supporting arms near one end for aseparate pivoting movement about a common axis, said supporting armsbeing disposed one above the other and being of different lengths, meanson the uppermost supporting arm adapted to engage successively with andtake along the other supporting arms when said uppermost arm is pivotedupwardly, at least one magnet means associated with each pair of top andbottom rollers, each said magnet mans including a pair of spaced magnetarms, means for securing one end of each magnet arm for a respectivemagnet means to a respective supporting arm and for adjusting saidrespective magnet means to different positions along the length of saidsupporting arm, the other ends of said magnet arms for said respectivemagnet means opposite said supporting arm being spaced by an air gapfrom said magnetizable part of said bottom roller, and a bearing memberof a nonmagnetizable material mounted between said magnet arms forrotatably mounting said top roller.

11. A device for loading the top roller of a drawing mechanism for. aspinning machine comprising a plurality" of pairs of associated top andbottom rollers arranged sep- 7 arately from and behind each other in arow, at least a part of each of said bottom rollers consisting of amagnetizable material, a common supporting tarmvf or all of said toprollers, means for pivotably mounting'said: sup- 7 porting arm near oneend, magnet means associa ted with each pair of 'topand bottom rollers,each said magnet means including a pair of spaced magnet arms, means forconnecting one end of each magnet arm of the respective tions, theotherends of said magnet arms for therespective 'magnetmeans opposite thesupporting armv being spaced by an air gap from said magnetizable partof the associated bottom roller, a bearing member of a nontmagnetizablematerial mounted between said magnet arms for rotatablymounting one of said top rollers, and means 5 for adjusting the positionof said bearing memberin a direction parallel to said magnet arms.

References Cited by the Examiner :UN ITEDSTATE S PATENTS 10" 1,562,231ell/25 Haynes 19-269 magnet means to said supporting arm andfor-adjusting a V V the respective magnet means-to ditferent positionsalong the length of said supporting arm and for securingfsaid 'ma'gnetmeans to said supporting arm in the adjusted posi- FOREIGN PATENTS[1,073,359 "1 60 German I 1,092,352 11/ 0, Germany.

DONALD-W... PARKER, Primary Examiner.

1. A DEVICE FOR LOADING THE TOP ROLLERS OF A DRAWING MECHANISM FOR ASPINNING MACHINE COMPRISING AT LEAST ONE PAIR OF ASSOCIATED TOP ANDBOTTOM ROLLERS, AT LEAST A PART OF SAID BOTTOM ROLLER CONSISTING OF AMAGNETIZABLE MATERIAL, A SUPPORTING ARM, MEANS FOR PIVOTABLE MOUNTINGSAID SUPPORTING ARM NEAR ONE END, MAGNET MEANS ASSO CIATED WITH SAIDPAIR OF TOP AND BOTTOM ROLLERS, SAID MAGNET MEANS INCLUDING A PAIR OFSPACED MAGNET ARMS, MEANS FOR SECURING ONE END OF EACH MAGNET ARM OFSAID MAGNET MEAND TO SAID SUPPORTING ARM, THE OTHER END OF EACH OF SAIDMAGNET ARMS OPPOSITE SAID SUPPORTING ARM BEING